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    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title>
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    <p>函数可以存储在变量中:</p>
    <p id="demo"></p>
    <script>
        var x = function (a, b) { return a * b };
        document.getElementById("demo").innerHTML = x(4,3);
    </script>

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